linux-kernel - Re: [RFC 5/5] MIPS: Add Realtek RTL8186 SoC support

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Date:   Mon, 1 Oct 2018 10:15:29 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Yasha Cherikovsky <yasha.che3@...il.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>, linux-mips@...ux-mips.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 5/5] MIPS: Add Realtek RTL8186 SoC support

On 01/10/18 09:48, Yasha Cherikovsky wrote:
> Hi Marc,
> 
> On Mon, 2018-10-01 at 09:19 +0100, Marc Zyngier wrote:
>> Hi Yasha,
>>
>> On 30/09/18 15:15, Yasha Cherikovsky wrote:
>>> The Realtek RTL8186 SoC is a MIPS based SoC
>>> used in some home routers [1][2].
>>>
>>> The hardware includes Lexra LX5280 CPU with a TLB,
>>> two Ethernet controllers, a WLAN controller and more.
>>>
>>> With this patch, it is possible to successfully boot
>>> the kernel and load userspace on the Edimax BR-6204Wg
>>> router.
>>> Network drivers support will come in future patches.
>>>
>>> This patch includes:
>>> - New MIPS rtl8186 platform
>>>       - Core platform setup code (mostly DT based)
>>>       - New Kconfig option
>>>       - defconfig file
>>>       - MIPS zboot UART support
>>> - RTL8186 interrupt controller driver
>>> - RTL8186 timer driver
>>> - Device tree files for the RTL8186 SoC and Edimax BR-6204Wg
>>>     router
>>>
>>> [1] https://www.linux-mips.org/wiki/Realtek_SOC#Realtek_RTL8186
>>> [2] https://wikidevi.com/wiki/Realtek_RTL8186
>>>
>>> Signed-off-by: Yasha Cherikovsky <yasha.che3@...il.com>
>>> Cc: Ralf Baechle <ralf@...ux-mips.org>
>>> Cc: Paul Burton <paul.burton@...s.com>
>>> Cc: James Hogan <jhogan@...nel.org>
>>> Cc: Thomas Gleixner <tglx@...utronix.de>
>>> Cc: Jason Cooper <jason@...edaemon.net>
>>> Cc: Marc Zyngier <marc.zyngier@....com>
>>> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
>>> Cc: Rob Herring <robh+dt@...nel.org>
>>> Cc: Mark Rutland <mark.rutland@....com>
>>> Cc: linux-mips@...ux-mips.org
>>> Cc: devicetree@...r.kernel.org
>>> Cc: linux-kernel@...r.kernel.org
>>> ---
>>>    arch/mips/Kbuild.platforms                    |   1 +
>>>    arch/mips/Kconfig                             |  17 ++
>>>    arch/mips/boot/compressed/uart-16550.c        |   5 +
>>>    arch/mips/boot/dts/Makefile                   |   1 +
>>>    arch/mips/boot/dts/realtek/Makefile           |   4 +
>>>    arch/mips/boot/dts/realtek/rtl8186.dtsi       |  86 +++++++
>>>    .../dts/realtek/rtl8186_edimax_br_6204wg.dts  |  45 ++++
>>>    arch/mips/configs/rtl8186_defconfig           | 112 +++++++++
>>>    arch/mips/include/asm/mach-rtl8186/rtl8186.h  |  37 +++
>>>    arch/mips/rtl8186/Makefile                    |   2 +
>>>    arch/mips/rtl8186/Platform                    |   7 +
>>>    arch/mips/rtl8186/irq.c                       |   8 +
>>>    arch/mips/rtl8186/prom.c                      |  15 ++
>>>    arch/mips/rtl8186/setup.c                     |  80 +++++++
>>>    arch/mips/rtl8186/time.c                      |  10 +
>>>    drivers/clocksource/Kconfig                   |   9 +
>>>    drivers/clocksource/Makefile                  |   1 +
>>>    drivers/clocksource/timer-rtl8186.c           | 220
>>> ++++++++++++++++++
>>>    drivers/irqchip/Kconfig                       |   5 +
>>>    drivers/irqchip/Makefile                      |   1 +
>>>    drivers/irqchip/irq-rtl8186.c                 | 107 +++++++++
>>
>> Could you please split this into at least three patches (arch code,
>> clocksource, irqchip) to ease the review?
>>
>> Thanks,
>>
>> 	M.
> 
> Currently the RTL8186_IRQ and the RTL8186_TIMER Kconfig entries depend on
> MACH_RTL8186 (which is added in the MIPS portion of the same patch).
> Also, MACH_RTL8186 in MIPS selects these two options.
> 
> What is the best way to split that?

It is absolutely fine to have something depending on a non-selectable 
config option, which would allow you to split things up as finely as you 
want. Just have the patch enabling the config option last.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...